55157700 has 72 divisors (see below), whose sum is σ = 171877888. Its totient is φ = 13576320.

The previous prime is 55157689. The next prime is 55157701. The reversal of 55157700 is 775155.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (55157701) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3172 + ... + 10971.

Almost surely, 2^55157700 is an apocalyptic number.

55157700 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

55157700 is an abundant number, since it is smaller than the sum of its proper divisors (116720188).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55157700 is a wasteful number, since it uses less digits than its factorization.

55157700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14173 (or 14166 counting only the distinct ones).

The product of its (nonzero) digits is 6125, while the sum is 30.

The square root of 55157700 is about 7426.8230085279. The cubic root of 55157700 is about 380.6583693016.

The spelling of 55157700 in words is "fifty-five million, one hundred fifty-seven thousand, seven hundred".